{"product_id":"scientific-cutting-tools-qhc75-5-16-boring-grooving-bar-holder","title":"Scientific Cutting Tools QHC75-5\/16 Boring Grooving Bar Holder","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SCIENTIFIC CUTTING TOOLS QHC75-5\/16 is a boring and grooving bar holder designed to secure and position boring bars in CNC lathes and turning centers. It features a 5\/16-inch inner diameter bore and a 3\/4-inch outer diameter body, with an overall length of 3.25 inches and a head diameter of 0.87 inches. The holder includes a 3\/8-18 NPT through-coolant port, allowing directed coolant delivery to the cutting zone for improved chip evacuation and tool life. Four lock-down screws provide firm, repeatable clamping of the boring bar during operation.\u003c\/p\u003e\n\u003cp\u003eThis holder is used in precision turning and boring operations on CNC lathes and manual turning centers. It is suited for internal grooving, profiling, and boring applications where secure tool retention and consistent coolant delivery are required. Machinists and toolroom technicians working in production or job-shop environments will find this holder fits into Series QHC tooling setups. The through-coolant design makes it well-suited for deep-bore or interrupted-cut applications where heat and chip buildup are concerns.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e5\/16-inch ID bore and 3\/4-inch OD body for use with matching boring bars\u003c\/li\u003e\n  \u003cli\u003e3.25-inch overall length for reach in standard turning applications\u003c\/li\u003e\n  \u003cli\u003e3\/8-18 NPT through-coolant port for directed coolant delivery at the cutting zone\u003c\/li\u003e\n  \u003cli\u003eFour lock-down screws for secure, repeatable bar clamping\u003c\/li\u003e\n  \u003cli\u003e0.87-inch head diameter sized for compact tooling setups\u003c\/li\u003e\n  \u003cli\u003ePart of the Series QHC boring and grooving bar holder family\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or direct-fit tooling component for Series QHC boring and grooving bar holder setups using 5\/16-inch ID boring bars.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by qualified machinists or toolroom technicians. Power down and lock out the machine spindle before mounting or removing the holder from the turret. Tighten the four lock-down screws evenly to prevent bar deflection or runout. Verify coolant line connection at the 3\/8-18 NPT port is leak-free before running the machine.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInner Diameter (ID)\u003c\/strong\u003e: 5\/16 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOuter Diameter (OD)\u003c\/strong\u003e: 3\/4 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length (OAL)\u003c\/strong\u003e: 3.25 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Diameter\u003c\/strong\u003e: 0.87 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Port Thread\u003c\/strong\u003e: 3\/8-18 NPT\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Type\u003c\/strong\u003e: Through Coolant\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Lock Down Screws\u003c\/strong\u003e: 4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: QHC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.0625 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: SCIENTIFIC CUTTING TOOLS\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: QHC75-5\/16\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SCIENTIFIC CUTTING TOOLS","offers":[{"title":"Default Title","offer_id":52025061507378,"sku":"QHC75-5\/16","price":70.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/479b4174ac699dfda5cd04098c87f478.jpg?v=1790015261","url":"https:\/\/voomisupply.com\/products\/scientific-cutting-tools-qhc75-5-16-boring-grooving-bar-holder","provider":"Voomi Supply","version":"1.0","type":"link"}